Fair Value Measurements - Other Hedges (Details) (USD $)	9 Months Ended			3 Months Ended																		3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Foreign currency forward contracts	Sep. 30, 2013 Foreign currency forward contracts	Sep. 30, 2014 Other Current Assets	Dec. 31, 2013 Other Current Assets	Sep. 30, 2014 Other Current Liabilities	Dec. 31, 2013 Other Current Liabilities	Sep. 30, 2014 Hedges designated as hedging instruments Cash flow hedges	Dec. 31, 2013 Hedges designated as hedging instruments Cash flow hedges	Sep. 30, 2014 Hedges designated as hedging instruments Cash flow hedges Other Current Assets	Dec. 31, 2013 Hedges designated as hedging instruments Cash flow hedges Other Current Assets	Sep. 30, 2014 Hedges designated as hedging instruments Cash flow hedges Other Current Liabilities	Dec. 31, 2013 Hedges designated as hedging instruments Cash flow hedges Other Current Liabilities	Sep. 30, 2014 Other hedges not receiving hedge accounting	Dec. 31, 2013 Other hedges not receiving hedge accounting	Sep. 30, 2014 Other hedges not receiving hedge accounting Other Current Assets	Dec. 31, 2013 Other hedges not receiving hedge accounting Other Current Assets	Sep. 30, 2014 Other hedges not receiving hedge accounting Other Current Liabilities	Dec. 31, 2013 Other hedges not receiving hedge accounting Other Current Liabilities	Sep. 30, 2014 Other Expense	Sep. 30, 2013 Other Expense	Sep. 30, 2014 Other Expense	Sep. 30, 2013 Other Expense
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net foreign currency loss																						$ 1,500,000	$ 600,000
Gain (loss) on foreign currency contracts	(1,100,000)	1,300,000		(700,000)	200,000																			(1,900,000)	0
Notional Amount	82,500,000		163,200,000							60,000,000	133,800,000					22,500,000	29,400,000
Derivative assets fair value						2,600,000	5,100,000					2,600,000	5,100,000					0	0
Derivative liabilities fair value								$ 0	$ (700,000)					$ 0	$ (700,000)					$ 0	$ 0